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I have multiple dmg's on my desktop all of which mount except one. Skype.
I am running Mac 10.4.11 and there is multiple articles on the internet where dmg's wouldn't mount but it was too wide ranged. I downloaded an old version of skype for 10.4.11 via mac.old-apps. And the worst part is: Its worked fine in the past. I've mounted it previously but i was new to Mac and never copied the application into the Apps folder. One day i got on and it just wouldn't mount. I would click on it and it would look like it was going to open but it wouldn't.
I have a eMac PowerPC g4 processor if it matters

"I've mounted it previously but i was new to Mac and never copied the application into the Apps folder."
I didn't know what it was asking me to do so i would just double click on the icon and Skype would open. Since then I have figured out what it was asking but i cant now because the dmg wont mount. Hence the question.

The bottom line problem here is that you are not properly installing applications, you are trying to run them from the disk image, which as you've discovered is not correct.

Sometimes, DMG files mount PKG installers, and sometimes (as with Skype), the disk image opens to a pictorial representation of the program's icon and an alias to your Application folder. Drag the icon to the app folder and it will be copied to your Application folder.

Then you can eject the image and trash the DMG. You don't need them anymore.

From now you, you launch Skype from your Application folder, the Lauchpad if you use it, or by dragging the Application folder Skype icon to the dock and launching it from there.

I tried downloading it but when the download finished the icon in the downloads list turned into a white page and so when i click on it it said "Safari can't open the file "Skype" because no available application can open it." I found the downloaded disk image on my desktop and tried to open it but it did the exact same thing it did in my first post.

nah all I have is Safari and Light Browser bc i couldnt find a browser i liked that supported PPC with 10.4.11
Im currently trying to download using TenFourFox (Firefox)
Nope didn't work. When I opened it from the downloads list though, it said it was verifying and checking volumes and stuff, and at the end it said "Mounting" but when the dialogue box closed, no disk image